Installed home solar in Delaware commonly runs about $2.50 to $3.00 per watt before incentives, so a 7 kW system costs roughly $17,500 to $21,000 (confirm with local quotes). At Delaware’s 19.38 cents per kWh power rate, simple payback usually lands near 10 to 12 years before SRECs or grants. The federal 25D homeowner credit ended December 31, 2025.
Delaware homeowners pay about 19.38 cents per kWh for electricity (EIA retail sales, residential Delaware, as of May 2026), a little above the national average, so the money question is simple: what does a system cost here, and how fast does the bill it erases pay it back. This page walks the cost per watt, the payback math, and what changed in 2026. For the full incentive picture, see our Delaware solar incentives guide.
A 7 kW rooftop system in Wilmington produces about 9,546 kWh a year (NREL PVWatts v8), and at Delaware’s 19.38 cents per kWh residential rate that is roughly $1,850 of grid power you stop buying each year (EIA, May 2026). Dover pencils out a bit higher at about 9,755 kWh. That annual offset is the engine behind the payback below.
How much does solar cost in Delaware?
Price is quoted in dollars per watt of system size. A typical residential install commonly runs about $2.50 to $3.00 per watt before any incentives. That is a national benchmark, not a Delaware filing, so treat the table as a starting point and get itemized local quotes to confirm your own $/W. Your price moves with system size, roof complexity, panel and inverter choice, and the installer.
| System size | Fits a home that uses | Estimated installed cost ($2.50 to $3.00/W) |
|---|---|---|
| 5 kW | Smaller bill, roughly $100 to $150/mo | About $12,500 to $15,000 |
| 7 kW | Average bill, roughly $150 to $250/mo | About $17,500 to $21,000 |
| 10 kW | Larger home or an EV, $250+/mo | About $25,000 to $30,000 |
Cost ranges are a national $/W benchmark for planning, not a guaranteed price. Delaware charges no statewide sales tax, so equipment is bought tax-free. Confirm your quote before you budget.
What is the solar payback in Delaware?
Payback is cost divided by what you stop paying the utility. The table pairs the cost above with a production-based offset. Production is scaled from the verified Wilmington PVWatts figure by system size, then multiplied by the 19.38 cents per kWh rate. This is the plain bill-offset payback, before any SREC income or Green Energy Program grant, which can shorten it.
| System size | Estimated annual production | Estimated yearly bill offset | Simple payback |
|---|---|---|---|
| 5 kW | About 6,820 kWh | About $1,320 | About 10 to 12 years |
| 7 kW | About 9,546 kWh | About $1,850 | About 10 to 12 years |
| 10 kW | About 13,640 kWh | About $2,640 | About 10 to 12 years |
Estimates, not a guarantee. Production is scaled from NREL PVWatts v8 for Wilmington and priced at the current EIA rate; a Delaware SREC sold each year and a Green Energy Program grant, where available, would shorten these paybacks, but their values change, so verify current numbers before you count them. Rates, production, and prices vary.
What moves your payback in 2026
Four things decide where you land in that 10 to 12 year window:
- Your electric rate. At about 19.38 cents per kWh, every kWh your roof makes offsets a little more than the national average, and rising rates push the payback shorter over time (EIA).
- Your production. Roof pitch, orientation, and shading swing output. Estimate yours with NREL’s free PVWatts calculator before you size a system.
- Net metering. Delaware credits the power you export back to the grid, and state policy has credited customer generation at the retail rate (DSIRE). The exact carry-forward and any annual true-up differ by provider, so verify the current terms with your utility. For the mechanics, see how net metering credits your solar exports. Delmarva Power customers can read our Delmarva Power Delaware solar guide.
- No federal credit in 2026. The 30% federal Residential Clean Energy Credit (Section 25D) ended for expenditures made after December 31, 2025, under the One Big Beautiful Bill Act, so a Delaware homeowner buying with cash or a loan in 2026 cannot claim it (IRS). See what the federal solar tax credit change means in 2026.
Delaware does have state-side help, and that is the honest upside. Delaware runs a Solar Renewable Energy Credit (SREC) market tied to its Renewable Portfolio Standard solar requirement, so your system can earn a tradable credit for the power it generates, and a state Green Energy Program has offered grants toward residential solar (DSIRE). Both can add income or cut your net cost and shorten the payback above. Current SREC prices and grant amounts change and vary by utility and program funding, so verify today’s values with your installer and the program administrator before you count them in your math. Delaware also charges no statewide sales tax, so you buy the equipment tax-free.
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How you pay changes the cost you carry
The sticker price is one thing; how you finance it decides your out-of-pocket and your payback. To put nothing down at installation, see the options in our guide to no upfront cost solar in Delaware.
| How you pay | Up-front cost | Best when |
|---|---|---|
| Cash | Full system price | You want the shortest payback and the most lifetime savings |
| Solar loan | Little or none, financed over time | You want to own the system with low money down and keep the SREC income |
| Lease or PPA | $0-up-front where you qualify | You want no out-of-pocket cost and a lower or fixed power price without owning |
A lease or PPA has no up-front cost, but the company owns the panels, terms typically run 20 to 25 years and may include an annual escalator, and total payments can exceed a cash purchase. No 2026 Delaware homeowner gets the federal residential credit, since that credit ended after December 31, 2025. If a $0-up-front path fits you, check your options and match with installers. For a full payback breakdown, see the financial case for whether solar panels are worth it.
Frequently asked questions
How much does solar cost in Delaware?
Installed home solar commonly runs about $2.50 to $3.00 per watt before incentives, so a 5 kW system is roughly $12,500 to $15,000, a 7 kW system is about $17,500 to $21,000, and a 10 kW system is about $25,000 to $30,000. Those are national planning benchmarks, not a Delaware price filing, so get itemized local quotes to confirm your own dollars per watt. Delaware charges no statewide sales tax, so equipment is bought tax-free.
What is the payback on solar in Delaware?
At the state’s 19.38 cents per kWh rate, a typical system offsets a solid annual bill, so simple payback usually lands near 10 to 12 years on bill savings alone, before any SREC income or Green Energy Program grant that would shorten it. A 7 kW system in Wilmington produces about 9,546 kWh a year (NREL PVWatts v8), roughly $1,850 of grid power at today’s rate (EIA, May 2026). Your real payback depends on your quote, your roof, and how much power you self-consume.
Does Delaware have solar incentives in 2026?
Yes. Delaware runs a Solar Renewable Energy Credit (SREC) market tied to its Renewable Portfolio Standard, so your system can earn tradable credits, and a state Green Energy Program has offered grants toward residential solar. Amounts and SREC prices change and vary by utility and program funding, so verify current values with your installer and the program administrator. Delaware also charges no statewide sales tax on the equipment.
Does a Delaware homeowner qualify for the federal solar tax credit in 2026?
Not as a homeowner buying in 2026. The 30% federal Residential Clean Energy Credit (Section 25D) ended for expenditures made after December 31, 2025, under the One Big Beautiful Bill Act, so a cash or loan buyer cannot claim it. A separate commercial credit (Section 48E) can apply to leased and PPA systems, but the business that owns the system claims it, not the homeowner.
Does net metering improve the payback?
Yes. Delaware credits the power your system exports to the grid, and state policy has credited customer generation at the retail rate (DSIRE), which raises the value of every kWh your roof makes. The exact carry-forward and any annual true-up differ by provider, so confirm the current terms with Delmarva Power, Delaware Electric Cooperative, or your municipal utility before you size a system.
By the SolarFY Editor, reviewed August 2026. Cost and payback figures are our own estimates built from NREL PVWatts v8 production and the EIA Delaware residential rate, with incentive facts verified against DSIRE and IRS sources; see our data and methodology for how we compute them. Prices, production, tariffs, SREC values, and programs change, so confirm current numbers with local installer quotes and each source before you decide. MySolarFY does not provide tax or financial advice; consult a licensed professional about your own situation. Learn more about the MySolarFY team and how we work.
MySolarFY is a free service that matches homeowners with licensed solar installers. We are not an installer, financing company, or government program. “No up-front cost” refers to qualifying lease or PPA financing, where eligible homeowners may have no out-of-pocket cost at installation. Lease and PPA terms typically run 20 to 25 years, may include an annual price escalator, and total payments may exceed the cost of a cash purchase. Homeowners do not get the federal residential credit that ended after December 31, 2025. Solar panels are not free and monthly payments apply. Cost, savings, payback, eligibility, incentives, and rates vary and are not guaranteed. See our full disclaimer.
